What is a Supercube? - COmmon Cube Questions

(mostly transcript from video)

What is a Supercube?

When I started cubing I heard this term a lot but  had no idea what people were talking about.  I assumed they were talking about some giant cube.

What a supercube is is a cube where you have to orient the centers (or any other piece on larger cubes that do not normally have restrictions).  On a normal cube the centers can be turned any which way and still be considered solved.

Many supercubes are just "sticker mods" like the one shown below.  It is a regular Rubik's cube with Cubesmith stickers added.  If you solve it like a normal cube the centers might be turned 90° or 180° with the arrows pointing in different directions that the ones around it. 

Many people will solve the cube by orienting the centers as they go, but many PLL cases end up turning the centers in the end and you have to do one or two algorithms to fix it.  

To turn a center 180° you just do 
(R U R' U) five times

To turn the center in front of you clockwise and one to the left counter clockwise you do 
(M' U M) E (M' U' M) E'  

You just do variations on that one depending on what faces need to turn what directions.  You will never just have one face that needs to turn 90°.

Shape mods and picture cubes are also considered supercubes since the centers need to be correct to either make the cube be "cubic' (for shape mods) or for the image on the cube to make sense.